Bar stock and reinforcing bar



April 1947- o. WENNBERG EIAL 2,418,382

BAR STOCK AND REINFORCING BAR Filed Sept. 8, 1945 2 Sheets-Sheet 1 I[/VVE'NYWBS 49' Odd Mflmery Jose M 9. 527165 H 51;

HIJOJZNEY.

Patented Apr. 1, 1947 BAR STOCK AND REINFORCING BAR OddWennberg,.Manhasset, and Joseph D. Stites,

New York, N. Y., assignors to Wegner Machincry Corporation, Long IslandCity, N. Y., a corporation of New York 7 Application September 8, 1945,Serial No. 615,225

This invention relates to reinforcing bars for use in concretestructures and the like, and particularly to that type of bar whichcomprises two rod-like sections joined in substantially parallelalignment by an integral intermediate section, or web, of lessercross-sectional area than either of said rod-like sections, which typeof bar is twisted around its longitudinal axis before use to form ineffect a helical structure comprising two helices having a common axis.The use and purpose of such bar and the reasons for twisting the sameare all well known, and it is likewise well known to provide on thistype of bar ribs arranged on the outer surfaces of the bar, usuallytransversely, diagonally or spirally, herein called transverse ribs, forthe express purpose of increasing the strength of the bond between thebar and the concrete or like material in which it is set or contained.

An object of this invention is to provide a bar stock of the above typewhich, when twisted and used as a reinforcing element, forms with theconcrete or similar substance in which it is set a bond of greatstrength.

A further object of the invention is to provide a twisted reinforcingbar of the described type 7 Claims. (01. 72-111) Figs. 9, and 11 arecross-sectional views of other untwisted bar stock shaped in accordancewith this invention.

. substantially parallel alignment by the intermehaving ribs so shapedas to promote between the bar and the concrete a lasting bond of suchstrength as will successfully resist the stresses arising in reinforcedconcrete structures.

Other objects and advantages will be apparent from the followingdescription of the invention with respect to the specific embodimentsthereof which are illustrated in the attached drawing:

In the drawing:

Fig. 1 is aplan view of a bar stock, before the twisting operation,embodying the principles of this invention; a

Fig. 2 is a View of the same bar at right angles to the view shown inFig. 1;

Fig. 3 is a plan view of the same bar after twisting, said bar beingthus ready to be used as a reinforcing element;

Fig. 4 is a cross-sectional view of the untwisted.

bar stock shown in Figs. 1 and 2, taken at 4-4 as indicated;

Fig. 5 is a plan View of another bar embodying the principles of thisinvention;

Fig. 6 is a side View of yet another bar embodying the principles ofthis invention;

Fig. '7 is a cross-sectional view of the untwisted bar stock shown inFig. 5, taken at l'! as indicated;

Fig. 8 is a cross-sectional view of the untwisted cated;

diate section, or web, I6. This web has a crosssectional area which isless than that of either of the rod-like sections. The rod-like sectionsare usually roughly, or approximately, circular in cross section,bywhich is meant that they are circular, elliptical or ovate in shape,the exact shape forming no part of this invention and. varying somewhataccording to the specific method of manufacture, which is usually sometype of rolling process. The web l6 may bear the proportion shown in thedrawing to the rodlike sections IE, or it may be thicker or wider, itsspecific shape and size being no part of the present invention. It willbenotecl that the general shape formed by the web section and the tworod-like sections is roughly that of adumbbell, and many different andspecific shapes of this dumbbell form have been shown and described inthe art. Running along the outer surface of each rod-like section l5'andlongitudi- It isnally thereof is the longitudinal rib l1. usuallypresent in reinforcing bars of the type here under discussion becausethe manufacture of the bar by rolling is simplified if a certain amountof metal, as represented by the.longi'-' tudinal rib I1, is providedbetween the mill rolls during the bar shaping operation.

The advantages and benefits of the present my; vention derive from theshape of the transverse ribs disposed on the bar. We have discoveredthat if the transverse ribs such as the ribs Id in Figs. 1 to 4,inclusive), have peripheral surfaces which bar will be materiallyimproved and enhanced. In the preferred form of the invention each ribis roughly, or approximately, triangular in peripheral outline or hassections of its extending surface in that form. The form taken by theribs 1 3 l8 of the bar shown in Figs. 1 to 4, inclusive, if preferred,but the benefits of the invention may be obtained by the provision ofribs of equivalent shape. Another desirable form is shown in Fig. 9,Where the ribs 30 are so shaped as to form two projecting. angles 3!,thereby providing, in effect,

two triangular shaped wings or lugs projecting from the same surface ofthe rod-like section of the bar. The form shown in Fig. 4 is, however,preferred and when used, the rib I8 is preferably so located that theapex of its outwardly extending angle lies above the outer, i. e.web-free, surfaceof the section 15. However, good results will beobtained if the rib is so formed that the apex of its projecting anglelies outwardly of the inner surface of the section, as illustrated inFig. 10 by the location of ribs 25 with respect to the section 24, orlies in intermediate positions, as'illus trated in Fig. 11 by thelocation of ribs 21 in the sectioni26i However, in these forms the.bonding strength isnot as great.

The ribs to which reference is thus made are,

from a manufacturing standpoint, best located in. planes at right anglesto. the longitudinalaxis A of the bar, but they may be diagonallydisposed without materially afiecting the bonding propertiesof the finaltwisted bar.

The spacing of the ribs with respect to the longitudinal axis ofthe barand with relation to each other isdictated by known considerations as tobonding strength, strength of the bar, etc. In

the: preferred form shown in Figs. 1 to 4,.inclusive,

atransverse'rib l8 is locatedon each side of each.

rodelike sectionl5 so that atintervals alon the bar a plane at rightangles to. the longitudinal axis Will passthrough four of the ribs l8.However, if desired, the ribs may be staggeredin variqugways, such asshown in Figs. 5 and 7, where the ribs 28 formed on each of the rod-likesections 2-9 are staggered so that no plane taken at right angles to thelongitudinal axis of the bar centainsmore than two ribs, those ribsbeing ribs.

on opposite; sides Of'the same rod-like section 29.

Again, byway of example, the ribs may be staggeredas indicated in Figs.6' and. 8; whereribs 22,.

which occur on either. side of the rod-like sections 23., are staggeredwith respect to eacho-ther so that the ribs on. the same sides of thesections 23 will fall-in thesame plane.

thepreferred form of bars. embodying the principles of this inventionthe ribs formed on the rod-like sections of the bar do not extendacrossithe intermediate web'which connects those sections in parallelalignment, i. e., the surface of the integral web isuninterrupted byribs. For example, in the. form shown in Figs. 1 to 4, inclusive, therib I3 merges into the surface of the rodlike section I5short of or atthe pointer area where the surface of-the web It merges into that of.therod-like section. The advantage of this arrangement is best describedby comparison with the: arrangement shown in Figs. 6 and 8 where the;

rib, 22, extends entirely around the bar but is shapd in accordance"with this invention, to form the projecting angular wings or lugs 33.There the rib extends over the web 34, andit will befobserved that ifthe bar is twisted, the rib-will- .form a pocket with the web.

formed'by the passage of the rib Hover the web. I 34maytrap moisture orair. as the concrete rises Thes pockets aroundthe bar, therebypreventing a. concretetion, as shown in Figs. 1 to 4, inclusive (andalso in the forms illustrated by Figs. 5, 7, 9, l0 and 11) the use ofribs which do not extend across the intermediate portion or web of thebar prevents the formation of such a pocket when the bar is tWistedQ.

The reference to specificforms and shapes in the foregoing descriptionhas been by way of example and with no intention of excluding suchequivalents as fall within the intent and spirit of the invention andthe language of the appended claims.

We claim:

l. A bar adapted to be twisted around its longitudinal axis to form areinforcing element, said bar comprising two elongated rod-like sectionsjoined in substantially parallel alignment by an integral web ofcross-sectional area less than the cross-sectional area of either ofsaid rod-like sections. and integral ribs transversely spaced atintervals onthe surface ofsaid bansaidribs be roughly angular in outlineand having a point-of maximumrib depth located over the outside surfaceof said rod-like section.

2'. A bar adapted to be twisted around its longitudinal axis to form areinforcing element, said bar comprising two elongate. rod-like sectionsjoined in substantially parallel alignment by an integral web: ofcrosssectional area less than. the cross-sectional area of either ofsaid rod-like; sections and outwardly extending integral ribstransversely spaced at intervals onthe-surface of' said bar, the:extending sections. of said ribs' being roughly triangular in peripheraloutline;

3. A bar adapted to betwisted, around its longitudinal axis tov form areinforcingelement, said. bar comprising two elongate rod-like sections.joined in substantially parallel alignment by an integral web ofcross-sectional area less. than the cross-sectional area of either ofsaid rodlike sections. and outwardly extending integral? ribstransversely spaced at intervals on the surface of said bar, said ribsbeing, approximately triangular inperipheral outline.

4. A- bar adapted to. be twisted. around. its longitudinal axis teform areinforcing element, said bar comprising two elongate rod-like sections.joined in. substantially parallel alignment-by an:

integral web ofcross-sectional area less: than metal. contact anddiminishing bonding strength ndalso providing a place where corrosion ofthe;

bar -due totrapped air and moisture may readily takeplace. Ii -the.preferred form of v thev invene the cross-sectionalarea of either of.said rod-like sections. and outwardly extending. integral ribstransverselyspaced at intervals on the surface of said bar; said ribsbeing approximately angular in peripheral outline, the apex oftheprojecting angle of said rib lying over the outside surfaceofsaid-rod-likesection. Q s

5. A bar adapted to be twisted around; its longitudinal axisto formapreinforcing element,.said bar comprising two elongate rod-likesections joined substantially parallel alignment by an integral web. ofcross-sectional area less than the cross-sectional area of either ofsaid rodlike sections and outwardly extending integral ribstransverselyspaced at intervals on the surface: of said bar, said ribs beingapproximately angular in peripheral. outline and. the surface of saidintegral. web being uninterrupted by said ribs.

6.. A. twisted reinforcing bar comprising two elongate rod-likeseetionslongitudinally joined by an integral web, said bar being twistedabout itslongitudinal axis into az helical, structure comprising two.helices having a common" axis and? REFERENCES CITED The followingreferences are of record in th 5 file of this patent:

UNITED STATES PATENTS Number Name Date Stites Sept. 16, 1941 Paque Dec.20, 1921 Ramsey Apr. 7, 1908

